Premium
Genistein aglycone reverses glucocorticoid‐induced osteoporosis and increases bone breaking strength in rats: a comparative study with alendronate
Author(s) -
Bitto A,
Burnett BP,
Polito F,
Levy RM,
Marini H,
Stefano V Di,
Irrera N,
Armbruster MA,
Minutoli L,
Altavilla D,
Squadrito F
Publication year - 2009
Publication title -
british journal of pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.432
H-Index - 211
eISSN - 1476-5381
pISSN - 0007-1188
DOI - 10.1111/j.1476-5381.2008.00100.x
Subject(s) - genistein , osteoporosis , medicine , bone resorption , endocrinology , bone mineral , aglycone , osteopenia , alkaline phosphatase , chemistry , glucocorticoid , bone remodeling , biochemistry , enzyme , organic chemistry , glycoside
Background and purpose: Glucocorticoid‐induced osteoporosis (GIO) is the leading cause of secondary osteoporosis. Clinical evidence suggests a role for genistein aglycone in the treatment of post‐menopausal osteopenia although proof of efficacy in comparison with currently available treatments is still lacking. To clarify this issue, we investigated the effects of genistein on bone compared with alendronate in experimental GIO. Experimental approach: A total of 28 female Sprague‐Dawley rats were used. GIO was induced by daily injections of methylprednisolone (MP; 30 mg·kg −1 s.c.) for 60 days. Sham GIO animals (Sham‐MP) were injected daily with the MP vehicle. At the end of the osteoporosis development period, MP rats were randomized to receive: vehicle ( n = 7), genistein aglycone (5 mg·kg −1 s.c.; n = 7) or alendronate (0.03 mg·kg −1 s.c.; n = 7). Treatment lasted 60 days. Sham‐MP animals were treated with vehicle for an additional 60 days. At the beginning and at the end of treatments, animals were examined for bone mineral density and bone mineral content. Bone‐alkaline phosphatase and carboxy‐terminal collagen cross links were determined; femurs were removed and tested for breaking strength and histology. Key results: Genistein aglycone showed a greater increase in bone mineral density, bone mineral content and in breaking strength than alendronate and significantly increased bone‐alkaline phosphatase (bone formation marker), reduced carboxy‐terminal collagen cross links (bone resorption marker), compared with alendronate. Both treatments improved bone histology and the histological score. Conclusion and implications: The results strongly suggest that the genistein aglycone might be an alternative therapy for the management of secondary osteoporosis.